View the book

Read Online
(853.8 K)PDF
(127.9 K)EPUB
Kindle
Daisy
(33.3 K)Full Text
(292.4 K)DjVu

All Files: HTTPS

Resources

Bookmark

Processing and Testing of Thermoplastic Composite Cylindrical Shells Fabricated by Automated Fiber Placement (2001)

Author: Hulcher, Anthony Bruce; McGowan, David M.; Grimsley, Brian W.; Johnston, Norman J
Subject: VISUAL PERCEPTION; IMAGING TECHNIQUES; DISPLAY DEVICES; CONFERENCES; CCD CAMERAS; PATTERN RECOGNITION; SPATIAL DISTRIBUTION; SURVEYS
Year: 2001
Language: English
Book contributor: NASA
Collection: nasa_techdocs

Description

Two 61-cm-diameter eight-ply quasi-isotropic IM7/PEEK cylindrical shells were fabricated by automated fiber placement the NASA Langley Research Center using only infrared radiant heat to preheat the substrate and incoming composite uni-tape. The shells were characterized by ultrasonic c-scans for overall consolidation quality, and by optical microscopy and acid digestion for void content. Compression tests were also performed. Although the material used in the study was of generally poor quality due to numerous splits and dry fiber regions, the process was able to achieve a net reduction in void content in the as-placed component. Microscopy of the composite shells revealed well-consolidated, void-free interfaces. The two cylinders were then tested in uni-axial compression in a 1334 kN-capacity hydraulic test machine until buckling occurred. A geometrically nonlinear finite element analysis was conducted, and the differences between the predicted and measured values were 18.0 and 25.8%, respectively. Inclusion of measured imperfections of the cylinder into the analysis is expected to reduce these differences.

Creative Commons license: Public Domain

Be the first to write a review
Downloaded 61 times Reviews

Selected metadata

Identifier:	nasa_techdoc_20020046692
Document-source:	CASI
Documentid:	20020046692
Nasa-center:	Langley Research Center; Marshall Space Flight Center
Online-source:	http://wayback.archive-it.org/1792/20100215175137/http://hdl.handle.net/2060/20020046692
Original-nasa-rights:	Unclassified; No Copyright; Unlimited; Publicly available;
Updated-added-to-ntrs:	2008-06-02
Licenseurl:	http://creativecommons.org/licenses/publicdomain/
Mediatype:	texts
Rights:	Public Domain
Identifier-access:	http://www.archive.org/details/nasa_techdoc_20020046692
Identifier-ark:	ark:/13960/t5r79762c
Ppi:	300
Ocr:	ABBYY FineReader 8.0